We launched on June 1, 2014. Growth in 2014 and 2015 have both been massive. A little over a year later, Uber is providing hundreds of thousands of safe rides each week in Austin.

HERE is another article on the subject. For added background - there's been several studies in Seattle, Philly and DC that all indicate the intuitive answer here that 'having more safe, reliable rides' cuts down on DWIs.